High-Capacity Electrical Energy Storage Device for Use in Electric and Hybrid Electric Vehicles

ABSTRACT

A high-capacity electrical energy storage device (HCEESD) comprising at least one capacitor having a pair of high-voltage main power terminals configured to receive electrical energy from an external main power source and a low-voltage auxiliary power source providing an amplified fixating voltage to a pair of low-voltage auxiliary power terminals of the at least one capacitor that causes the stored electrical energy to be retained so long as the low-voltage power source remains active. An electric locomotive that includes multiple banks of HCEESDs comprising capacitors in accordance with the invention connected in parallel to provide electrical energy to the electric locomotive without catenaries or a third rail is also disclosed.

RELATED APPLICATION(S)

This application is a continuation of U.S. Utility patent application Ser. No. 14/082,141, filed on Nov. 16, 2013, entitled “HIGH CAPACITY ELECTRICAL ENERGY STORAGE DEVICE,” by inventor Prakash Achrekar, and issued as U.S. patent Ser. No. 10/319,536 on Jun. 11, 2019, which utility patent application claims priority of U.S. Provisional Patent Application Ser. No. 61/796,719, filed on Nov. 19, 2012, entitled “HIGH CAPACITY ELECTRICAL ENERGY STORAGE DEVICE,” by inventor Prakash Achrekar, which applications are incorporated herein in their entireties by this reference.

BACKGROUND OF THE INVENTION 1. Field of the Invention

The invention is related generally to high-capacity electrical energy storage devices, and more particularly, to electrical energy storage devices comprising high surface area capacitors that are suitable for use in electric and hybrid electric vehicles.

2. Related Art

A capacitor is a well-known electrical component that is capable of storing electrical energy. Generally, capacitors may be classified as conventional electrostatic capacitors, electrolytic capacitors, or electric double-layer capacitors. Because the electrical energy is stored physically, with no chemical or phase changes taking place as occurs in conventional low-voltage lead-acid batteries, the process is highly reversible, and the discharge-charge cycle of a capacitor can be repeated over and over again, virtually without limit.

Capacitors are widely used in electronics for blocking direct current (DC) and passing alternating current (AC), and as signal filters, power sources, and the like. Generally, a capacitor comprises a pair of conductors that are separated by a dielectric region or material. Some capacitors may be “air” capacitors with no dielectric material. When a voltage is applied across the conductors, an electric field is generated in the conductors that stores energy. Recently, capacitors have been utilized as a supplement to conventional batteries or as accumulators that act as an energy storage device.

To serve as an energy storage device, a capacitor ideally possesses a high capacitance (where the unit of capacitance is the farad (F)). Conventional electrostatic capacitors with a high specific capacity utilizing solid dielectrics are well known. For example, capacitors using barium titanate (BaTiO₃) have a large permittivity of the dielectric material on the order of ε>1000 and specific capacity of approximately 0.3 F/cm³. Electrolytic capacitors have a higher capacitance per unit volume but with performance disadvantages such as reliability issues related to the electrolyte selected.

As for the electric double layer capacitor (also referred to as supercapacitors or ultracapacitors), these types of capacitors store an electrical charge in a double layer at the interface formed between a high-surface-area carbon electrode and an electrolytic solution electrolyte. The specific capacity of such capacitors is on the order of 2-46 F/cm³ at the maximal specific energy (the amount of energy stored per unit of mass) up to 0.045 megajoules per kilogram (MJ/kg). Unfortunately, the electrolytic double layer principle utilized by these types of capacitors usually breaks down at voltages above approximately 5 volts. Such low voltage thus requires stacking many of these capacitors in series, which considerably reduces their total capacitance, thereby reducing their charge storage potential.

Thus, a primary disadvantage of all types of capacitors relative to conventional batteries is their low energy densities and low maximum voltages. Of course, combining banks of capacitors in series and in parallel can overcome these disadvantages, but then the resultant systems may be too bulky and heavy (i.e., less energy storage/unit volume or weight) making them impractical as replacements for batteries. Another disadvantage is the capacitor's high self-discharge or leakage, i.e., the capacitor cannot store energy for as long as a conventional battery. The newer class of supercapacitors charge and discharge rapidly and may have an equivalent series resistance (ESR) of less than 1 ohm, but a maximum voltage of 5.2V or less. They are available in much larger capacities, such as 300 F or greater. They may be used to supply the massive surge current required to get a large electric motor started or to store energy in hybrid electric vehicles generated under braking or when excess torque is produced by an internal combustion engine (ICE) or to frequently start engines in start-stop systems intended to deliver fuel savings and reduce emissions. However, because supercapacitors tend to have significantly higher self-discharge rates, they cannot store energy for as long as a conventional battery and thus they present some disadvantages when used in electric vehicles or hybrid electric vehicles as energy storage devices.

With respect to hybrid electric vehicles (HEV), capacitors are used primarily as an auxiliary power source for an ICE, which may be a gasoline or diesel engine, and as one example, these capacitors may be supercapacitor modules for automotive use that provide regenerative energy capture during braking/coasting (where conventional batteries are not suitable because of low charging rates) and use the recaptured energy to accelerate the vehicle and then cruise or start the engine frequently in a start-stop system.

As for electric vehicles (EV), these are embodiments where capacitors, especially supercapacitors, are the prime mover of a vehicle without the use of other energy sources such as diesel engines, gas turbines or fuel cells. In general, the EV is powered entirely by electricity, which may be from overhead lines, a third rail, or on-board energy storage such as batteries or capacitors. Electric locomotives, which are self-powered vehicles used for pulling trains of passenger or freight cars along railroad tracks, benefit from the high efficiency of electric motors, are quiet compared to diesel locomotives, and have a higher power output than diesel locomotives. However, the problem with many electric locomotives is that the electricity is usually delivered by overhead lines (often called “catenaries”) or a third rail that requires costly infrastructure including substations and control systems that add weight and complexity to the electric locomotive. Therefore it is highly desirable to develop electric locomotives that are able to travel long distances entirely without the use of catenaries or third rails.

In view of the foregoing, there is an ongoing need for providing improved capacitors having a higher energy density and maximum voltage, as well as reduced self-discharge, to be used in HEVs or EVs without overhead lines or third rails.

SUMMARY

To address the foregoing problems, in whole or in part, and/or other problems that may have been observed by persons skilled in the art, the present disclosure provides systems, apparatus, instruments, devices, methods, and/or processes, as described by way of example in implementations set forth below.

A high-capacity energy storage device (or system) including at least one capacitor having a pair of high-voltage main power terminals and a pair of low-voltage auxiliary power terminals is disclosed, where electric energy is supplied to the at least one capacitor through the high-voltage main power terminals by a main power source that generates the electrical energy that is stored in the capacitor. The high-capacity energy storage device may also include a secondary low-voltage potential providing an amplified high voltage to the electrodes of the capacitor through the low-voltage auxiliary power terminals that causes the stored electrical energy to be retained in the at least one capacitor so long as the secondary low-voltage potential remains active.

The high-capacity electrical energy storage device may be an apparatus including a capacitor that includes an anode electrode (positive) and a cathode electrode (negative) and a dielectric material positioned between the anode electrode and the cathode electrode. In a method of operation a main power source provides electrical energy to the high-capacity electrical energy storage device to be stored therein through a pair of high-voltage main power terminals to the anode electrode and the cathode electrode, and a low-voltage auxiliary power source applies a high voltage potential as a fixating (or sacrificial) electrical voltage through a pair of low-voltage auxiliary power terminals to the anode electrode and the cathode electrode of the high-capacity energy storage device.

A high-capacity electrical energy storage device in accordance with the invention that may be utilized in a gasoline-electric hybrid vehicle is disclosed. The hybrid electric vehicle may include an internal combustion engine (ICE) powered by fuel (gasoline or diesel) in a tank, an electric motor powered by a high-voltage battery pack, a controller for power and battery management, and a low-voltage conventional auxiliary battery. This hybrid electric vehicle may also include a recoverable energy storage system (RESS), which recovers kinetic energy during operation of the hybrid motor vehicle, e.g., during braking, and a high-capacity electrical energy storage device in accordance with the invention, which stores the recovered energy for later use as determined by the user of the hybrid motor vehicle or by a controller in the hybrid electric vehicle.

Also disclosed is a plurality of high-capacity electrical energy storage devices in accordance with the invention arranged in several banks positioned in an electric locomotive, where the electrical energy stored in the several banks of high-capacity energy storage devices is sufficient to power the electric locomotive from a starting point to a desired end point entirely with the stored electrical energy and without any additional external electrical energy from overhead lines or a third rail.

Other devices, apparatus, systems, methods, features and advantages of the invention will be or will become apparent to one with skill in the art upon examination of the following figures and detailed description. It is intended that all such additional systems, methods, features and advantages be included within this description, be within the scope of the invention, and be protected by the accompanying claims.

BRIEF DESCRIPTION OF THE FIGURES

The invention may be better understood by referring to the following figure(s). The components in the figures are not necessarily to scale, emphasis instead being placed upon illustrating the principles of the invention. In the figures, like reference numerals designate corresponding parts throughout the different views.

FIG. 1 shows a block diagram of an example of an implementation of a high-capacity electrical energy storage device in accordance with the invention having a single cell.

FIG. 2 shows a block diagram of an example of an implementation of a high-capacity electrical energy storage device in accordance with the invention having three cells.

FIG. 3 shows a block diagram of an example of an implementation of a high-capacity electrical energy storage device in accordance with the invention having n-numbered cells.

FIG. 4 shows a block diagram of an implementation of an electric hybrid motor vehicle having an internal combustion engine (ICE), a high-voltage hybrid vehicle (HV) battery pack, an auxiliary battery, and a high-capacity electrical energy storage device in accordance with the invention.

FIG. 5a shows a block diagram of an implementation of an electric locomotive having a plurality of high-capacity electrical energy storage devices in accordance with the invention arranged in a plurality of interconnected energy banks as its entire main energy source.

FIG. 5b shows a block diagram of an implementation of a power compartment comprising a plurality of blocks each containing a plurality of high-capacity electrical energy storage devices in accordance with the invention that provide electrical energy to the electric locomotive of FIG. 5A.

DETAILED DESCRIPTION

With reference to FIG. 1, a block diagram 100 of an implementation of a high-capacity electrical energy storage device (“HCEESD”) 102 is depicted. The HCEESD 102 may include a capacitor that includes an anode electrode (positively charged) 106, a cathode electrode (negatively charged) 108, with the anode electrode 106 and the cathode electrode 108 separated by a dielectric material 110. Coupled to the capacitor 104 may be a main power source 114. The main power source 114 supplies the energy to be stored in the capacitor 104 by way of a pair of high-voltage power terminals 120 a and 120 b connected to the anode electrode 106 and the cathode electrode 108, respectively, and may take various forms based on the implementation utilizing HCEESD 102. As an example, in a gasoline-electric hybrid motor vehicle, the main power source 114 may be a high-voltage battery pack containing multiple sealed Nickel Metal Hydride (NiMH) or lithium-ion battery modules, or any other type of battery modules, while in other implementations, such as a recoverable energy storage system (RESS), it may be a variable-voltage alternator that converts kinetic energy during deceleration of a motor vehicle that is stored in the capacitor 104.

In other implementations of the HCEESD 102, the capacitor 104 may be replaced by a series/parallel bank that includes a plurality of electric double-layer capacitors, or a series/parallel bank that includes a plurality of electrolytic capacitors (see, e.g., FIGS. 2 and 3), with each cell of these capacitors including an anode electrode (positively charged) and a cathode electrode (negatively charged), with the anode electrode and the cathode electrode separated by a dielectric material.

A fixating (or sacrificial) electrical voltage is applied to a pair of low-voltage auxiliary power terminals 130 a and 130 b on the anode electrode 106 and the cathode electrode 108, respectively, by the low-voltage auxiliary power source 116 connected in parallel with the capacitor 104, with the fixating electrical charge being applied so long as the low-voltage auxiliary power source 116 remains active. The low-voltage auxiliary power source 116 may be a conventional 12V automotive battery. The application and removal of the fixating electrical voltage may be manually controlled by a user or automatically by a controller (not shown). The low-voltage auxiliary power source 116 may include an amplifier (not shown) that amplifies a lower voltage, e.g., 12 volts, to a higher operational voltage that matches the desired output voltage of the HCEESD 102. In this example, diode 118, or any other form of electronics that prevents any reverse current flow from the HCEESD 102 into the low voltage auxiliary power source 116, may be utilized to prevent damage to the auxiliary power source 116.

By applying the amplified sacrificial voltage to the capacitor 104, the HCEESD 102 will retain its stored electrical charge so long as this amplified sacrificial voltage remains applied, thus significantly extending the time during which the stored electrical charge will be maintained within the HCEESD 102 before self-discharging.

Turning to FIG. 2, a block diagram 200 of another example of an implementation of a HCEESD 202 is shown. The HCEESD 202 may include a capacitor 204, including two pairs of anode electrodes (positively charged) 206 a and 206 b and cathode electrodes (negatively charged) 208 a and 208 b, forming three parallel cells. In this example embodiment, these three cells are formed by anode electrode 206 a and cathode electrode 206 b separated by dielectric material 210 and anode electrode 208 a and cathode 208 b separated by dielectric material 210.

Coupled to the capacitor 204 by way of a pair of high-voltage power terminals 220 a and 220 b connected to the anode electrode 206 and the cathode electrode 208, respectively, may be a main power source 214. The main power source 214 supplies the energy to be stored in the capacitor 204 and may take various forms based on the type of implementation utilizing HCEESD 202. As an example, in a gasoline-electric hybrid motor vehicle, the main power source 214 may be a high-voltage battery pack containing multiple sealed Nickel Metal Hydride (NiMH), or any other type of battery modules, while in other implementations, such as a recoverable energy storage system (RESS), it may be a variable-voltage alternator that converts kinetic energy during deceleration of a motor vehicle that is stored in the capacitor 204.

FIG. 3 shows a block diagram 300 of another example of an implementation of a HCEESD 302 having multiple cells. The HCEESD 302 includes a capacitor 304, including multiple pairs of anode electrodes (positively charged) 306 a-306 n and cathode electrodes (negatively charged) 308 a-308 n, which in this example produces nine parallel cells formed by a dielectric material 310 formed within each pair of anode electrodes 306 a-306 n and cathode electrodes 308 a-308 n. It will be understood and appreciated by those skilled in the art that n pairs of anode electrodes and cathode electrodes may be utilized in other implementations, where the number n may vary as required by the desired voltage and power of HCEESD 302.

Coupled to the capacitor 304 by way of a pair of high-voltage power terminals 320 a and 320 b connected to the anode electrodes 306 a and 306 n and the cathode electrodes 308 a and 308 n, respectively, may be a main power source 314. The main power source 314 supplies the energy to be stored in the capacitor 304 and may take various forms based on the type of implementation utilizing HCEESD 302 as noted earlier. A fixating (or sacrificial) electrical charge voltage is applied to a pair of low-voltage auxiliary power terminals on the anode electrode 306 a and the cathode electrode 306A by the low-voltage auxiliary power source 316 b and to a pair of low-voltage auxiliary power terminals on the cathode electrode 308 a and anode electrode 308B by the low-voltage auxiliary power source 316 a, connected in parallel with the HCEESD 302, with the fixating electrical charge being retained so long as the low-voltage auxiliary power sources 316 a and 316 b remain active. These fixating voltages are applied to capacitors that are not part of the HCEESD that provides electrical power, as they are opposite in polarity and are intended to suppress energy decay of the HCEESD.

The low-voltage auxiliary power sources 316 a and 316 b may be a conventional 12V automotive battery. The application and removal of the fixating electrical voltage may be manually controlled by a user or automatically by a controller (not shown). The low-voltage auxiliary power sources 316 a and 316 b may each include an amplifier (not shown) that amplifies a lower voltage, e.g., 12 volts, to a higher operational voltage that matches the desired output voltage of the HCEESD 302. In this example, diodes 318 a and 318 b or any other form of electronics that prevents any reverse current flow from the HCEESD 302 into the low-voltage auxiliary power sources may be utilized to prevent damage to the secondary power sources 316 a and 316 b, respectively.

FIG. 4 shows a high-level block diagram 400 of a gasoline-electric hybrid motor vehicle 402 that utilizes a HCEESD 420 in accordance with the invention. The gasoline-electric hybrid motor vehicle 402 typically includes an internal combustion engine (ICE) 404, a high-voltage hybrid vehicle (HV) battery pack 406, a low-voltage conventional lead-acid battery 408, an electric motor 410, an electric generator 412, and an inverter 414. In operation, power cables 430 carry high-voltage direct current (DC) from HV battery pack 406 to inverter 414, where the DC voltage is converted to alternating current (AC) to drive electric motor 410. Electric motor 410 may be contained in a transaxle (not shown) of gasoline-electric hybrid motor vehicle 402 in order to power this vehicle. Also, inverter 414 may be configured to convert AC from electric motor 410 to DC to recharge HV battery pack 406.

Gasoline-electric hybrid motor vehicle 402 may also include HCEESD 420, in accordance with the invention, and a secondary power source 422 that supplies a fixating electrical charge to power terminals of high-capacity electrical energy storage device 420 to retain its charge. In another example of an implementation, the secondary power source 422 may be supplied power from the low-voltage conventional lead-acid battery 408.

Electrical energy may be supplied by the HCEESD 420 replacing HV battery pack 406. Alternatively, the electrical energy stored by HCEESD 420 may be used in tandem with the HV battery pack 406. Recovered braking energy captured by recoverable energy storage system (RESS) 424, which may be, as an example, a variable-voltage alternator that converts kinetic energy to electric power that in turn may be stored in HCEESD 420.

In the gasoline-electric hybrid motor vehicle 402, use of the HCEESD 420 may have several advantages. First, in many regenerative energy capture systems, the charging current produced during braking/coasting may be too large for a conventional battery to accept but can be accepted by a high-capacity electrical energy storage device. Second, stop-start systems are being utilized in hybrid vehicles to reduce fuel consumption and vehicle emissions, and the rapid and repeated starting and stopping of the vehicle cannot be provided by conventional batteries as well as by supercapacitors because of the latter's significantly faster charge and discharge times. Additionally, a high-capacity electrical energy storage device, in accordance with the invention, is able to retain its charge over an extended period of time, thus providing better engine starting and sustaining capabilities.

FIG. 5a shows a block diagram of an implementation of an electric locomotive having a plurality of high-capacity electrical energy storage devices in accordance with the invention (HCEESDs) arranged in a plurality of interconnected energy banks as its entire main energy source. Electric locomotive 500 comprises a cab 504, which is the area occupied by an engineer who operates the electric locomotive 500. Accessory compartment 506 is that portion of electric locomotive 500 that contains transformers, rectifiers, inverters, batteries, 3-phase AC motors, cooling fans, controllers and other operating instruments, etc. Included within these accessories and components are 3-phase AC motors 510 that provide AC power to the wheels of electric locomotive 500.

Power compartment 520 contains multiple banks of HCEESDs that are connected and provide power to the 3-phase AC motors 510 by means of power cables 512. Auxiliary batteries 522 supply low-voltage auxiliary power to low-voltage auxiliary power terminals of each of the HCEESDs of power compartment 520. Power compartment 520 also contains switching circuitry 524 that is in general in signal communication with each of the HCEESDs of power compartment 520 with the assistance of a controller in the accessory compartment 506 (not shown), and in a method of operation selects an HCEESD to provide electrical energy to the 3-phase AC motors 510. When that HCEESD runs out of electrical energy, another energy bank of the HCEESD is selected to provide electrical energy to electric locomotive 500. Also shown in FIG. 5a are passenger cars 550, which may be pulled by electric locomotive 500; also included within passenger cars 540 may be freight cars, tankers and the like.

In a method of operation, HCEESD 532 of power compartment 520 of electric locomotive 500 may supply electric energy to the 3-phase AC motors 510 of electric locomotive 500. When all the electric energy of HCEESD 533 has been used up, a controller (not shown) will select another HCEESD to provide electric energy to the 3-phase AC motors 510. HCEESDs 532 represent banks of HCEESDs already used and no longer available to provide electrical energy, while HCEESDs 534 represent banks of HCEESDs available for future use.

Turning to FIG. 5b , a block diagram of an implementation of a power compartment 502 comprising a plurality of blocks each containing a plurality of high-capacity electrical energy storage devices in accordance with the invention that provide electrical energy to the electric locomotive of FIG. 5a is shown. Power compartment 520 contains multiple banks of HCEESDs that are connected and provide power to the 3-phase AC motors 510, FIG. 5a , by means of power cables 512, FIG. 5a . External to power compartment 520 are external charging station 540 and external auxiliary charger 542, which provide high-voltage main power to high-voltage main power terminals of the HCEESDs and low-voltage auxiliary power terminals of the HCEESDs, respectively. Because these power sources are external to the power compartment 520, charging of the HCEESDs will take place at terminals of the routes that the electric locomotive 500 travels.

HCEESDs 548 a, 548 b, and 548 c represent n banks of multiple HCEESDs that provide electric energy to the 3-phase AC motors 510, FIG. 5a , of electric locomotive 500 by power cables 560. The number n of the available banks is determined by the loads to be carried the electric locomotive 500, the length of the routes to be travelled, and the dimensions of the HCEESDs included in the banks. The transfer of electric power from the HCEESDs is controlled by switching circuitry 520 as directed by a controller (not shown) in the electric locomotive 500.

In general, the high-capacity electrical energy storage devices shown in FIGS. 1-3 may be used as replacements for conventional batteries and accumulators, or as supplements thereto. For example, the high-capacity electrical energy storage devices may be used in all manner of motor vehicles, such as electric or hybrid electric automobiles, hybrid or electric mass transport vehicles, as well as smaller motor vehicles, such as golf carts and lawn mowers. The high-capacity electrical energy storage devices may also be used in portable devices, such as computers and other hand-held devices. In essence, one skilled in the art will recognize that the high-capacity electrical energy storage device in one form or another may be utilized to replace conventional battery packs however they may be used.

As for the high-capacity electrical energy storage device itself, its design may vary with differing applications. For example, the high-capacity electrical energy storage device can be tailored by varying the surface area of electrodes, the type of dielectric material, and the thickness of the dielectric, material of construction, etc. Furthermore, because the various implementations are not limited by the electrolyte dissociation inherent in conventional capacitors, these implementations can be charged at significantly higher voltages based on the thickness and type of the dielectric used. Voltage for storing an electrical charge using these techniques can be over a range from 1-1,000,000 volts and store considerable energy as required by the applicable operation.

A plethora of materials could be used for making the device. Such materials may include, for example, copper, nickel, stainless steels, carbon, silver, gold, conductive ceramics, nanostructured materials, etc. The high-capacity electrical storage device, as well as its capacitors, may also employ different shapes, such as cubes, ellipses, conductive wire mesh, sponge, cylinders, uneven fragments of crushed conductive media, spikes, etc.

In each implementation, the thickness of the dielectric layer may be relatively uniform without any pores and relatively thin. A variety of dielectric materials are readily available, such as ceramics, glass, plastics, and oxides of several metals that can be used for the intended application. The thickness of the dielectric layer may be between 0.000001 mm to several centimeters, depending on the application, the desired voltage and power, storage capacity, ease of fabrication, etc. The thickness of the dielectric coating may vary based on a number of factors. For example, a thinner dielectric coating allows for a higher charge storage capacity, but a lower breakdown voltage. In some embodiments, the dielectric coating may be sintered in situ.

An estimate of the storage capacity of an example of an implementation of a high-capacity electrical energy storage device in accordance with the invention (HCEESD) may be calculated as follows. In this example, each HCEESD of the type shown in FIGS. 2 and 3 may have dimensions 1 meter (m)×1 m×0.25 m, which provides an HCEESD with a volume of 1 m×1 m×0.25 m (or 0.25 m³). A cell of the HCEESD comprises two electrodes, with two copper sheets of 0.5 mm thickness for each electrode. Each electrode has a 1 mm carbon coating with a particle size of 0.01 micron (μm) particles (=0.00000001 m diameter=10−8 m).

As an example, using activated carbon, the surface area of each 0.01 μm particle (carbon sphere=π×d²=3.1417×0.00000001²)=3.1417×10⁻¹⁶ m²). There are approximately 25 million layers of carbon particles of 0.00000001 m in the 0.25 m thickness of the 1 m² square electrode. Each cell has four electrode copper plates each with a thickness of 0.0005 m (or 0.002 m); the distance between copper plates is 0.0001 m; and there 100,000 particle layers of 0.001 m each with each copper plate coated with 1 mm of carbon particles, giving a total thickness of 0.0031 m. Thus, in a thickness of 0.25 m, there are approximately 80 units (0.25 m/0.0031 m) with four plates each or 320 plates.

Other parameters of this example may be:

The thickness of the dielectric BaTiO₃=0.1 mm between opposing electrodes, with permittivity ε=8.854×10⁻¹²;

The dielectric constant (k) of BaTiO₃=1200; and

Charging voltage=250 volts for operating a 25 volt motor. and

The surface area of copper electrodes=1 m×1 m=1 m².

Therefore, in this example, the total surface area=sphere surface area+plate surface area. Total surface area=3.142×10⁶ m² (neglecting plate area).

$\begin{matrix} {{{Capacitance} = {k \times ɛ \times \left( {{Surface}\mspace{14mu} {Area}\text{/}{Thickness}\mspace{14mu} {of}\mspace{14mu} {dielectric} \times {plates}} \right)}};} \\ {{= {8.854 \times 10^{- 12} \times 1200 \times \left( {25,000,000\text{/}0.0001\mspace{14mu} m \times 320} \right)}};} \\ {= {849,984\mspace{14mu} {Farads}}} \end{matrix}$ Coulombs  at  one  volt  (1  Farad = 1  Coulomb).

1 Coulomb=0.00027778 Ampere-hours (Ah). Therefore, 849984 Coulombs=236.1 Ah. At 250 volts, this capacitance can be converted to an energy of 59 kWh, which. would be sufficient to drive a Tesla-type automobile about 400 miles on a single charge.

A design for hybrid electric vehicles (such as Prius) could be used to boost mileage with a much smaller sized cell, say for example, a 1 m×1 m×0.1 m² bank. As for the electric locomotive, obviously higher capacities and voltages will be required, and this can be achieved by modifying the dimensions of the bank of cells. For example, the dimensions of the copper sheets can be changed, for example, to 1.5 m×1.5 m or 2.0 m×2.0 m, and the thickness of the bank of cells can be increased to 1.0 m or greater. Because it is intended that there will be multiple banks of cells in the electric locomotive, the number of these banks of cells will be a factor in determining the dimensions of each bank of cells.

The foregoing description of implementations has been presented for purposes of illustration and description. It is not exhaustive and does not limit the claimed inventions to the precise form disclosed. Modifications and variations are possible in light of the above description or may be acquired from practicing examples of the invention. The claims and their equivalents define the scope of the invention. 

What is claimed is:
 1. A high-capacity electrical energy storage device (“HCEESD”), the HCEESD comprising: at least one capacitor having a pair of high-voltage main power terminals and a pair of low-voltage auxiliary power terminals; wherein the high-voltage power terminals of the HCEESD are configured to receive electrical energy from a main power source and store electrical energy in the at least one capacitor; and an auxiliary power source coupled to the low-voltage auxiliary terminals of the high-capacity electrical storage device, wherein the auxiliary power source supplies a fixating electrical voltage to the at least one capacitor.
 2. The HCEESD of claim 1, where the low-voltage auxiliary power source includes an amplifier configured to provide a voltage equal to that supplied by the main power source.
 3. The HCEESD of claim 1, where the at least one capacitor comprises: an anode electrode; a cathode electrode; and a dielectric material positioned between the anode electrode and the cathode electrode.
 4. The HCEESD of claim 1, where the main power source is a high-voltage battery pack containing multiple sealed battery modules or lithium-ion battery modules.
 5. The HCEESD of claim 4, where the anode and cathode electrodes are manufactured from a material selected from a group consisting of activated carbon, carbon aerogel, xerogels, carbon nanotubes, carbon nano-fibers, nickel hydroxide (Ni(OH)₂) nano flakes, and any other conductive media that can be produced in large surface area particles. 